Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92e32d944e9a57c…

MALICIOUS

PDF

58.8 KB Created: 2020-04-12 15:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9c66c9bf5a4ca79bb4b77474138cbee SHA-1: 1aa4baa93998317618d16df209043a28efeb98b9 SHA-256: f92e32d944e9a57cc250baadb5483634153b5ed1e81db78249c1928c6108223e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to 'Prevencion de la violencia escolar' (prevention of school violence), which is likely a lure to attract clicks to the malicious URLs. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://westcoastnpl.com/uploads/1/3/1/4/131438316/131438316.html#prevencion+de+la+violencia+escolar+concepto
    • http://alethiacarestruly.com/uploads/1/3/0/4/130483248/kosekepiduloriruzix.pdf
    • http://handworkscoffeestudio.com/uploads/1/3/0/7/130776399/xazakokiriri_wosuwadiw.pdf
    • http://rgtrades.net/uploads/1/3/0/6/130640236/d994f85.pdf
    • http://lynnluetgers.com/uploads/1/3/1/3/131398123/labodiwamovufowix.pdf
    • http://lottafuss.com/uploads/1/3/0/7/130740462/sujoturen.pdf
    • http://sherlockhomesstl.com/uploads/1/3/0/6/130639583/kilidetido_fakufenomon_vovoriwoxu.pdf
    • http://functionalfitnessa2.com/uploads/1/3/1/0/131070826/e1a41dfa5440e98.pdf
    • http://whalesharktourslapaz.com/uploads/1/3/1/4/131453558/1bd63b923.pdf
    • http://rightpurpose.com/uploads/1/3/0/2/130271002/zafogovefomijefaxos.pdf
    • http://photosbyjessicabowman.com/uploads/1/3/0/5/130541327/59ebf956d5aad.pdf
    • http://joshandmary.com/uploads/1/3/0/5/130547552/6eb2419.pdf
    • http://prayingforreign.com/uploads/1/3/0/6/130639259/kubasodix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8c4.bin
f0b5fcd8686aa0604d7007e0a28d863a933a750c06f850f791dc561937a53dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C4 8660 bytes
font_01_sfnt_off0000c7e1.bin
fc0bcc9d08d908b8b1287d0ab2df4e3a5be78b1d1690d8efe3ff9d2c54ab5679		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 16064 bytes

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